The　oriented　growth　of　the　hydroxyapatite　(HAp)　nanorod　array　on　the　glass　Substrate　with　a　ZnO　seed　layer　was　Investigated.　The　samples　were　characterized　by　X-ray　diffraction,　Fourier　transform　infrared　spectroscopy,　scanning　electron　microscopy,　and　transmission　electron　microscopy.　The　HAp　nanorods　have　a　length　of　about　2　mu　m　and　a　diameter　of　about　200　nm.　The　growth　mechanism　of　the　(0001)-oriented　HAp　nanorod　array　was　attributed　to　the　＂mold　effect＂　of　the　(0001)-oriented　ZnO　seed　layer.　The　dissolution　characteristics　of　the　as-prepared　HAp　nanorod　array　have　also　been　investigated.